/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.taskmanager;

import java.util.logging.Logger;

import net.sf.l2j.Config;
import net.sf.l2j.gameserver.ThreadPoolManager;
import net.sf.l2j.gameserver.model.L2Character;
import net.sf.l2j.gameserver.model.L2Object;
import net.sf.l2j.gameserver.model.L2World;
import net.sf.l2j.gameserver.model.L2WorldRegion;
import net.sf.l2j.gameserver.model.actor.instance.L2GuardInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2PlayableInstance;

public class KnownListUpdateTaskManager {
	protected static final Logger _log = Logger
			.getLogger(KnownListUpdateTaskManager.class.getName());

	private final static int FULL_UPDATE_TIMER = 100;
	// Do full update every FULL_UPDATE_TIMER * KNOWNLIST_UPDATE_INTERVAL
	public static int _fullUpdateTimer = FULL_UPDATE_TIMER;
	public static boolean updatePass = true;

	private KnownListUpdateTaskManager() {
		ThreadPoolManager.getInstance().scheduleAi(new KnownListUpdate(), 1000);
	}

	public static KnownListUpdateTaskManager getInstance() {
		return SingletonHolder._instance;
	}

	private class KnownListUpdate implements Runnable {
		protected KnownListUpdate() {
		}

		public void run() {
			try {
				for (L2WorldRegion regions[] : L2World.getInstance()
						.getAllWorldRegions())
					for (L2WorldRegion r : regions)
						// avoid stopping update if something went wrong in
						// updateRegion()
						try {
							if (r.isActive())
								updateRegion(
										r,
										(_fullUpdateTimer == FULL_UPDATE_TIMER),
										updatePass);
						} catch (Exception e) {
							e.printStackTrace();
						}
			} catch (Exception e) {
				_log.warning(e.toString());
			}
			updatePass = !updatePass;
			if (_fullUpdateTimer > 0)
				_fullUpdateTimer--;
			else
				_fullUpdateTimer = FULL_UPDATE_TIMER;
			ThreadPoolManager.getInstance().scheduleAi(new KnownListUpdate(),
					Config.KNOWNLIST_UPDATE_INTERVAL);
		}
	}

	public void updateRegion(L2WorldRegion region, boolean fullUpdate,
			boolean forgetObjects) {
		for (L2Object object : region.getVisibleObjects()) // and for all
															// members in region
		{
			if (object == null || !object.isVisible())
				continue; // skip dying objects
			if (forgetObjects) {
				object.getKnownList()
						.forgetObjects(
								(object instanceof L2PlayableInstance
										|| Config.GUARD_ATTACK_AGGRO_MOB
										&& object instanceof L2GuardInstance || fullUpdate));
				continue;
			}
			if (object instanceof L2PlayableInstance
					|| Config.GUARD_ATTACK_AGGRO_MOB
					&& object instanceof L2GuardInstance || fullUpdate) {
				for (L2WorldRegion regi : region.getSurroundingRegions())
					for (L2Object _object : regi.getVisibleObjects())
						if (_object != object)
							object.getKnownList().addKnownObject(_object);
			} else if (object instanceof L2Character)
				for (L2WorldRegion regi : region.getSurroundingRegions())
					if (regi.isActive())
						for (L2Object _object : regi.getVisiblePlayable())
							if (_object != object)
								object.getKnownList().addKnownObject(_object);
		}
	}

	private static final class SingletonHolder {
		protected static final KnownListUpdateTaskManager _instance = new KnownListUpdateTaskManager();
	}
}
